摘要
对铸态商用AZ91D镁合金固溶处理后进行高压扭转,再进行时效处理,利用光学显微镜,扫描电镜及X射线衍射对其微观结构和力学性能进行了详细研究。结果表明高压扭转大塑性变形使合金的晶粒尺寸由固溶态的～100μm细化到纳米晶,同时使基体中长杆状和块状的β-Mg（17）Al（12）析出相转变为颗粒状和椭圆块状。虽然经过高压扭转大塑性变形后的试样在时效处理过程中显微硬度呈下降趋势,但其硬度值较只经T6处理的试样相比有很大提高。只经高压扭转大塑性变形处理后的固溶态试样显示了最高显微硬度,其值为128 HV0. 1。
As-cast commercial AZ91D magnesium alloy was subjected to high pressure torsion（HPT）after solid solution treatment,and then aged.The microstructure and mechanical properties of the as-cast alloy were studied by optical microscope,scanning electron microscope and X-ray diffraction.The results show that the grain size of the alloy is refined from about 100μm to nanocrystalline by large plastic deformation of HPT,and the long rod and blockβ-Mg（17）Al（12）phases in the matrix are transformed into granular and elliptical bulk.Although the microhardness of the specimens after large plastic deformation of HPT decreases during aging treatment,the hardness value of the specimens treated with T6 is much higher than that after T6 treatment.The solution treated specimens with HPT plastic deformation but without aging show the highest microhardness,with a value of 128 HV0.1.
作者
冯凯旋
尹晓明
刘瑞
渠成
徐瑞
Feng Kaixuan;Yin Xiaoming;Liu Rui;Qu Cheng;Xu Rui(Key Laboratory of Metastable Materials Preparation Technology and Science,College of Materials Science and Engineering,Yanshan University,Qinhuangdao Hebei 066004,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第11期38-43,共6页
Heat Treatment of Metals
基金
国家自然科学基金(51675092)
